I am a little more than 4 weeks out from my marathon. I was supposed to do an 11 mile easy run this morning. Unfortunately, I got a 24 hour bug of some sort and threw up and ungodly amount of stuff every hour or so last night. So, I didn't run and was wondering if it was ok to miss a training run. Also, at the end of the week, my plan says to run an 8-15K tune-up race on Friday and then a 17 miler on Saturday. That doesn't seem right or possible in my opinion. I would assume my body would need a rest after a 15K race at max effort, not a 17 mile long run. Maybe elite runners will be able to accomplish this, but I just don't think it's a good idea. Should I skip the race and do the 17 mile long run or skip the long run and do the race or both? Curious as to how I should approach all of this. As usual, any advice would be much appreciated.
First, yes it's "okay" to miss a run here and there.
I don't know what training program you're using but there is some benefit in going hard one day, then slow and long the next. And I do mean slow. Walk some if it helps. The second day is about moving on tired legs.
http://www.runnersworld.com/race-training/tune-up-for-successful-racing
MARATHON
Regina Joyce was the 1981 NCAA 3,000m champion and ran for Ireland in the inaugural women's marathon at the 1984 Olympics. She resides in Redmond, Wash., where she coaches and competes as a masters athlete. Joyce considers tune-up races to be critical for marathon preparation. "They're basically your measuring stick," she says. "Are you getting stronger? Are you getting faster? Are you ready?"
What Distance & When
"I think the ideal situation would be to run a 10K early in your preparation," says Joyce. "Then run a half marathon as far out as you can, maybe five to six weeks. And then after you've started your taper, a 5K about a week to 10 days before your marathon."
Expectations & Adjustments
Joyce advises running tune-ups "fast and relaxed," without worrying about a particular finish time. "The key is to keep your eye on the goal. Sometimes you do go out and run your fastest 5K of all time, and that just adds to the joy of it. But the marathon is your target." She cautions against making training adjustments based upon tune-ups. The only time she's done that was while training for the 2009 Portland Marathon. "I ran a half marathon a month earlier and just felt horrible," she says. "I felt like I'd overdone it, and I took three or four days off . I allowed myself to recover." A month later, Joyce ran a great marathon.
Mistakes
"The mistake a lot of people make," says Joyce, "is to train harder after a disappointing tune-up race." Instead, runners should recognize that a poor result probably indicates the need for recovery, not more work. "They need to listen to their bodies and back off ," says Joyce.